TDS can provide various types of good quality control Top Hammer Rock Drilling tools for Mining Industry, Tunneling and Underground Engineering Construction drilling and Blasting Industry. Features ---Tapered Rods, MM/MF Rods. ---Coupling Sleeves, Shank Adapter. ---Tapered Bits(7°/11°/12°). ---Thread Button Bits(R25/R28/R32/R38/T38/T45/T51/GT60...). ---Retrac Button Bits, Reaming Bits with good quality control.